Diagnostic system check-body controls (BCM)

  • If there are no complaints on drivability, do not perform these diagnostic steps unless otherwise instructed in other sections.
  • Check for related Service Bulletins before starting the diagnosis.
  • Do not clear the DTC unless instructed to do so in a diagnostic step.
  • The battery should be fully charged.
  • The battery cable should be normal and securely connected.
  • The ground of the BCM should be securely connected to the correct position.
  • The BCM harness connectors should be clean and correctly connected.
  • The BCM terminals should be clean and correctly connected.
  • Vehicle information should be programmed correctly in the BCM.

1. Scan tool power-up check

1) Connect the scan tool.

2) Power up the scan tool. Does the scan tool power up?

Yes

=>Go to Scan tool communication verification.

No

Go to Scan tool does not power up.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) Scan tool does not power up".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 without DPD) Scan tool does not power up".

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) Scan tool does not power up".

2. Scan tool communication verification

1) Turn ON the ignition switch.

2) Check the communication status with the BCM using the scan tool. Does the scan tool communicate with the BCM?

Yes

=>Go to BCM DTC check.

No

Go to Lost communication with the BCM.

Refer to "64.Body Control 10I.Troubleshooting(BCM) lost communication with the BCM (models with radar sensor/ stereo camera)".

Refer to "64.Body Control 10I.Troubleshooting(BCM) lost communication with the BCM (models without radar sensor and stereo camera)".

3. BCM DTC check

1) Observe the BCM DTC information on the scan tool. Is a DTC set?

Yes

Go to the applicable DTC diagnosis.

No

=>Go to Customer's concern check.

4. Customer's concern check

1) Check the customer's concern. Is the customer's concern related to the immobilizer system?

Yes

Go to Diagnostic system check-Wireless Access Module.

Refer to "71.Security and Locks Control 10S.Troubleshooting(Wireless Access Module (Hi-version [Passive Entry and Start System])) Diagnostic system check-Wireless Access Module (Hi-version[Passive Entry and Start System])".

Refer to "71.Security and Locks Control 10S.Troubleshooting(Wireless Access Module (Mid-version/Lo-version [Except Passive Entry and Start System])) Diagnostic system check-Wireless Access Module (Mid-version/Lo-version [Except Passive Entry and Start System])".

No

=>Go to Symptom check.

5. Symptom check

1) Operate the vehicle and check the following symptoms. Is there any applicable symptom?

  • All doors neither lock nor unlock.
  • Auto door lock or auto door unlock does not work
  • Door at the driver side does not lock or unlock.
  • Door at the passenger side does not lock or unlock.
  • Rear right door does not lock or unlock.
  • Rear left door does not lock or unlock.
  • Door lock at the driver side does not work.
  • Door lock works with keyless entry functions, but does not answer back, or room light does not illuminate.
  • Windshield washer does not operate
  • Windshield wiper does not operate together with the windshield washer
  • Wiper stops at halfway even if the wiper switch is other than the OFF position
  • Wiper's auto-stop does not function
  • Anti theft does not operate

Yes

Go to the applicable symptom diagnosis.

Refer to "223.Body Control 36D.Symptom(BCM) all doors neither lock nor unlock".

Refer to "223.Body Control 36D.Symptom(BCM) auto door lock or auto door unlock does not work".

Refer to "223.Body Control 36D.Symptom(BCM) door at the driver side does not lock or unlock".

Refer to "223.Body Control 36D.Symptom(BCM) door at the passenger side does not lock or unlock".

Refer to "223.Body Control 36D.Symptom(BCM) rear right door does not lock or unlock".

Refer to "223.Body Control 36D.Symptom(BCM) rear left door does not lock or unlock".

Refer to "223.Body Control 36D.Symptom(BCM) door lock at the driver side does not work".

Refer to "223.Body Control 36D.Symptom(BCM) door lock works with keyless entry functions, but does not answer back, or room light does not illuminate".

Refer to "223.Body Control 36D.Symptom(BCM) windshield washer does not operate".

Refer to "223.Body Control 36D.Symptom(BCM) windshield wiper does not operate together with the windshield washer".

Refer to "223.Body Control 36D.Symptom(BCM) wiper stops at halfway even if the wiper switch is other than OFF position".

Refer to "223.Body Control 36D.Symptom(BCM) wiper's auto-stop does not function".

Refer to "223.Body Control 36D.Symptom(BCM) anti theft does not operate".

No

Go to Intermittent conditions of body control system.

Refer to "223.Body Control 36D.Symptom(BCM) intermittent conditions of body control system".

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